<!DOCTYPE html>
<html lang="en">
<head>
    <meta charset="UTF-8">
    <title>CSS像素</title>
    <style>
        body {
            padding: 0;
            margin: 0;
            background-color: #F7F7F7;
            /*height: 1400px;*/
        }

        .box {
            width: 1152px;
            height: 120px;
            background-color: red;
        }
    </style>
</head>
<body>
<div class="box"></div>
</body>
</html>